OP asked about Tac X and TSX. NOT the Tac TX with black tip which is shorter, expands easier, and is specifically designed for 300 Blackout in AR length magazines.

The first 2, that which the OP inquired, are the same bullet, different box.

The black tipped Tac TX is different.

NONE of these 3 bullets have blue tips. Tipped TSXs and LRXs do...